Since then, their user base has expanded by a very hefty 130 million users. Systrom has said that if Instagram continues to grow at this rate, it will not only be bigger than Facebook, but it "will be the biggest thing in the world." I don't know about that, because Kanye West's ego is pretty big, but hey, who am I to judge?

I don't see Instagram maintaining this growth without serious change, as they have nothing like Facebook on offer apart from sharing a 15-second video or some pictures. During an interview with Fast Company, the Instagram CEO said: "Now, will we continue to grow at this rate [and outgrow Facebook]? Different question."